Terminal Device, Network Device, Uplink Sending Method, And Uplink Receiving Method

ABSTRACT

The present disclosure relates to a terminal device, in which a processing module selects one or more normal carriers or special carriers from a first carrier set for an uplink subframe, where the first carrier set includes all carriers in carrier aggregation that are used by the terminal device to send a first uplink subframe; and a sending module cancels sending of the uplink subframe on one or more carriers, where the special carrier is a carrier on which the terminal device sends neither uplink data nor uplink control information in uplink, and the normal carrier is a carrier that is used by the terminal device to send uplink data and/or uplink control information. An uplink subframe on some carriers is rejected, thereby resolving a problem that information such as a downlink channel characteristic of a carrier cannot be obtained when no uplink reference signal is sent on the carrier.

CROSS-REFERENCE TO RELATED APPLICATIONS

This disclosure is a continuation of International Application No.PCT/CN2015/090415, filed on Sep. 23, 2015, the disclosure of which ishereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to wireless communications technologies,and in particular, to a terminal device, a network device, an uplinksending method, and an uplink receiving method.

BACKGROUND

In an evolution process of a Long Term Evolution (LTE) protocol, acarrier aggregation (CA) technology is introduced in Release (R) 10. Inthe technology, user equipment (UE) is allowed to simultaneously send orreceive data on a plurality of carriers. A network device such as anevolved NodeB (eNB) selects a cell as a primary cell (Pcell) of the UE,and uses a cell on another carrier as a secondary cell (Scell) of theUE. The UE may send or receive data on a plurality of aggregated cells.Herein, an LTE system that supports CA is referred to as an LTE CAsystem.

Referring to FIG. 1, in the LTE CA system, each UE is corresponding toone Pcell that is a cell 1 in FIG. 1 and one or more Scells that includea cell 2 and a cell 3 in FIG. 1. Both the primary cell and the secondarycell may be used to provide a transmission resource used for uplinkand/or downlink data transmission between the network device and the UE.The UE receives paging in the Pcell, and may perform a contention-basedrandom access process in the Pcell.

At present, in a typical case, the UE in the LTE CA system supportsaggregation of a maximum of five downlink carriers and aggregation of amaximum of two uplink carriers. That is, carrier aggregation of fivedownlink carriers and carrier aggregation of one uplink carrier areallowed, and carrier aggregation of five downlink carriers and carrieraggregation of two uplink carriers are also allowed.

FIG. 2 is a schematic diagram in which UE supports carrier aggregationof two uplink carriers and carrier aggregation of five downlink carriersin a time division duplex (TDD) LTE system. Because the UE supports twouplink carriers, the UE can send a sounding reference signal (SRS) onlyin an uplink subframe on the two carriers on which the UE simultaneouslyworks. The TDD LTE system uses a time division duplex mode, and anuplink channel and a downlink channel that work on a same carrier havesimilar channel characteristics and are reciprocal. Therefore, if theSRS is sent only in the uplink subframe on the two carriers, onlychannel characteristics of downlink channels of the two carriers can beobtained, and downlink channel characteristics of remaining threecarriers cannot be obtained from the SRS that is sent in the uplinksubframe.

SUMMARY

In view of this, a terminal device, a network device, an uplink sendingmethod, and an uplink receiving method are provided, to resolve aproblem in a carrier aggregation scenario that information such asdownlink channel characteristics of some carriers cannot be obtainedwhen no uplink reference signal (such as an SRS) is sent on thesecarriers.

According to a first aspect, an embodiment of the present disclosureprovides a terminal device in a carrier aggregation system, including aprocessing module and a sending module, where

the processing module is configured to select one or more carriers froma first carrier set for a first uplink subframe, where the first carrierset includes all carriers in carrier aggregation that are used by theterminal device to send the first uplink subframe; and

the sending module is configured to cancel sending of the first uplinksubframe on the one or more carriers selected by the processing module,where

the one or more carriers selected by the processing module are normalcarriers or special carriers; and

the special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

With reference to the first aspect, in a first possible implementation,the processing module is specifically configured to:

when a power sum of the terminal device for sending the first uplinksubframe on all the carriers in the first carrier set is greater than amaximum transmit power of the terminal device, select the one or morecarriers from the first carrier set; and

a power sum of the terminal device for sending the first uplink subframeon carriers other than the selected one or more carriers in the firstcarrier set is not greater than the maximum transmit power of theterminal device.

With reference to the first aspect, in a second possible implementation,the processing module is specifically configured to:

when a quantity of carriers included in the first carrier set of theterminal device is greater than a quantity of uplink carriers that canbe simultaneously sent by the terminal device, select the one or morecarriers from the first carrier set; and

a quantity of carriers that is obtained by subtracting the one or morecarriers from the quantity of carriers included in the first carrier setis not greater than the quantity of uplink carriers that can besimultaneously sent by the terminal device.

With reference to the first aspect, or the first or the second possibleimplementation of the first aspect, in a third possible implementation,the special carrier is a carrier on which the terminal device sends onlyan uplink signal in uplink, and the uplink signal includes an uplinkreference signal and/or a preamble.

With reference to the third possible implementation of the first aspect,in a fourth possible implementation, the uplink reference signal is asounding reference signal SRS.

According to a second aspect, an embodiment of the present disclosureprovides a network device in a carrier aggregation system, including:

a processing module, configured to determine that a terminal devicecancels sending of a first uplink subframe on one or more carriers in afirst carrier set, where the first carrier set includes all carriers incarrier aggregation that are used by the terminal device to send thefirst uplink subframe; and

a receiving module, configured to cancel receiving of the first uplinksubframe on the one or more carriers, where

the one or more carriers are normal carriers or special carriers; and

the special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

With reference to the second aspect, in a first possible implementation,the processing module is specifically configured to:

if determining that a power sum of the terminal device for sending thefirst uplink subframe on all the carriers in the first carrier set isgreater than a maximum transmit power of the terminal device, determinethat the terminal device cancels sending of the first uplink subframe onthe one or more carriers in the first carrier set.

With reference to the second aspect, in a second possibleimplementation, the processing module is specifically configured to:

when a quantity of carriers included in the first carrier set is greaterthan a quantity of uplink carriers that can be simultaneously sent bythe terminal device, determine that the terminal device cancels sendingof the first uplink subframe on the one or more carriers in the firstcarrier set.

With reference to the second aspect, or the first or the second possibleimplementation of the second aspect, in a third possible implementation,the special carrier is a carrier on which the terminal device sends onlyan uplink signal in uplink, and the uplink signal includes an uplinkreference signal and/or a preamble.

With reference to the third possible implementation of the secondaspect, in a fourth possible implementation, the uplink reference signalis a sounding reference signal SRS.

According to a third aspect, an embodiment of the present disclosureprovides a terminal device in a carrier aggregation system, including:

a processing module, configured to determine that the terminal devicecancels sending of K consecutive orthogonal frequency divisionmultiplexing OFDM symbols in a second uplink subframe, where

the K OFDM symbols are located on one or more normal carriers in asecond carrier set, the second carrier set includes all carriers incarrier aggregation that are used by the terminal device to send thesecond uplink subframe, and K is a positive integer and is not greaterthan a quantity of OFDM symbols included in the second uplink subframe;and

a sending module, configured to send a first uplink signal in the Ksymbols on one or more special carriers in the second carrier set, where

the special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

With reference to the third aspect, in a first possible implementation,a length of the K symbols is not less than a sum of first duration andsecond duration;

the first duration is duration required for sending the first uplinksignal; and

the second duration is duration in which the terminal device is switchedbetween carriers.

With reference to the first possible implementation of the third aspect,in a second possible implementation, the one or more normal carriers inthe second carrier set belong to a first timing advance group TAG 1, andthe one or more special carriers in the second carrier set belong to asecond timing advance group TAG 2; and

the length of the K symbols is not less than a sum of the firstduration, the second duration, and the third duration, and the thirdduration is a length that is agreed on in advance according to a TAdifference between the TAG 1 and the TAG 2.

With reference to the third aspect, or the first or the second possibleimplementation of the third aspect, in a third possible implementation,the K symbols are the last K OFDM symbols in the second uplink subframe.

With reference to any one of the third aspect, or the first to the thirdpossible implementations of the third aspect, in a fourth possibleimplementation,

the sending module is further configured to send a second uplink signalin a third uplink subframe on the one or more special carriers in athird carrier set, where the third carrier set includes all carriers incarrier aggregation that are used by the terminal device to send thethird uplink subframe; and

the processing module is further configured to determine that theterminal device cancels sending of M consecutive OFDM symbols of anadjacent subframe of the third uplink subframe, where the adjacentsubframe is also an uplink subframe, where

the M OFDM symbols are located on one or more normal carriers in thethird carrier set, and M is a positive integer and is not greater than aquantity of OFDM symbols included in the adjacent subframe.

With reference to the fourth possible implementation of the thirdaspect, in a fifth possible implementation, a length of the M OFDMsymbols is not less than the fourth duration; and

the fourth duration is duration in which the terminal device is switchedbetween carriers.

With reference to the fifth possible implementation of the third aspect,in a sixth possible implementation, the one or more normal carriers inthe third carrier set belong to a third timing advance group TAG 3, andthe one or more special carriers in the third carrier set belong to afourth timing advance group TAG 4; and

the length of the K symbols is not less than a sum of the fourthduration and fifth duration, and the fifth duration is a length that isagreed on in advance according to a TA difference between the TAG 3 andthe TAG 4.

With reference to any one of the fourth to the sixth possibleimplementations of the third aspect, in a seventh possibleimplementation,

if the adjacent subframe is a next subframe of the third uplinksubframe, the M symbols are the first M OFDM symbols in the nextsubframe; and/or

if the adjacent subframe is a previous subframe of the third uplinksubframe, the M symbols are the last M OFDM symbols in the previoussubframe.

With reference to any one of the fourth to the seventh possibleimplementations of the third aspect, in an eighth possibleimplementation, the second uplink signal includes an uplink referencesignal and/or a preamble.

With reference to any one of the third aspect, or the first to theeighth possible implementations of the third aspect, in a ninth possibleimplementation, the processing module is specifically configured to:

when a power sum of the terminal device for sending the second uplinksubframe on all the carriers in the second carrier set is greater than amaximum transmit power of the terminal device, determine that theterminal device cancels sending of the K OFDM symbols; and

a power sum of the terminal device for sending the second uplinksubframe on carriers other than the one or more normal carriers on whichthe K OFDM symbols are located in the second carrier set is not greaterthan the maximum transmit power of the terminal device.

With reference to any one of the third aspect, or the first to theeighth possible implementations of the third aspect, in a tenth possibleimplementation, the processing module is specifically configured to:

when a quantity of carriers included in the second carrier set of theterminal device is greater than a quantity of uplink carriers that canbe simultaneously sent by the terminal device, determine that theterminal device cancels sending of the K OFDM symbols; and

a quantity of carriers that is obtained by subtracting the one or morenormal carriers on which the K OFDM symbols are located from thequantity of carriers included in the second carrier set is not greaterthan the quantity of uplink carriers that can be simultaneously sent bythe terminal device.

With reference to any one of the third aspect, or the first to the tenthpossible implementations of the third aspect, in an eleventh possibleimplementation, the first uplink signal includes an uplink referencesignal and/or a preamble.

With reference to the eighth or the eleventh possible implementation ofthe third aspect, in a twelfth possible implementation, the uplinkreference signal is a sounding reference signal SRS.

According to a fourth aspect, an embodiment of the present disclosureprovides a network device in a carrier aggregation system, including:

a processing module, configured to: determine that a terminal devicecancels sending of K consecutive orthogonal frequency divisionmultiplexing OFDM symbols in a second uplink subframe, and determinethat the terminal device sends a first uplink signal in the K symbols onone or more special carriers in the second carrier set, where

the K OFDM symbols are located on one or more normal carriers in thesecond carrier set, the second carrier set includes all carriers incarrier aggregation that are used by the terminal device to send thesecond uplink subframe, and K is a positive integer and is not greaterthan a quantity of OFDM symbols included in the second uplink subframe;and

a receiving module, configured to: cancel receiving of the K OFDMsymbols, and receive the second uplink signal in the K symbols on theone or more special carriers in the second carrier set, where

the special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

With reference to the fourth aspect, in a first possible implementation,a length of the K symbols is not less than a sum of first duration andsecond duration;

the first duration is duration required for sending the first uplinksignal; and

the second duration is duration in which the terminal device is switchedbetween carriers.

With reference to the first possible implementation of the fourthaspect, in a second possible implementation, the one or more normalcarriers in the second carrier set belong to a first timing advancegroup TAG 1, and the one or more special carriers in the second carrierset belong to a second timing advance group TAG 2; and

the length of the K symbols is not less than a sum of the firstduration, the second duration, and the third duration, and the thirdduration is a length that is agreed on in advance according to a TAdifference between the TAG 1 and the TAG 2.

With reference to the fourth aspect, or the first or the second possibleimplementation of the fourth aspect, in a third possible implementation,the K symbols are the last K OFDM symbols in the second uplink subframe.

With reference to any one of the fourth aspect, or the first to thethird possible implementations of the fourth aspect, in a fourthpossible implementation,

the processing module is further configured to: determine that theterminal device sends a second uplink signal in a third uplink subframeon the one or more special carriers in a third carrier set, anddetermine that the terminal device cancels sending of M consecutive OFDMsymbols of an adjacent subframe of the third uplink subframe, where theadjacent subframe is also an uplink subframe, and the third carrier setincludes all carriers in carrier aggregation that are used by theterminal device to send the third uplink subframe; and

the receiving module is further configured to: receive the second uplinksignal on the one or more special carriers in the third carrier set, andcancel receiving of the M consecutive OFDM symbols in the adjacentsubframe of the third uplink subframe, where

the M OFDM symbols are located on one or more normal carriers in thethird carrier set, and M is a positive integer and is not greater than aquantity of OFDM symbols included in the adjacent subframe.

With reference to the fourth possible implementation of the fourthaspect, in a fifth possible implementation, a length of the M OFDMsymbols is not less than the fourth duration; and

the fourth duration is duration in which the terminal device is switchedbetween carriers.

With reference to the fifth possible implementation of the fourthaspect, in a sixth possible implementation, the one or more normalcarriers in the third carrier set belong to a third timing advance groupTAG 3, and the one or more special carriers in the third carrier setbelong to a fourth timing advance group TAG 4; and

the length of the K symbols is not less than a sum of the fourthduration and fifth duration, and the fifth duration is a length that isagreed on in advance according to a TA difference between the TAG 3 andthe TAG 4.

With reference to any one of the fourth to the sixth possibleimplementations of the fourth aspect, in a seventh possibleimplementation,

if the adjacent subframe is a next subframe of the third uplinksubframe, the M symbols are the first M OFDM symbols in the nextsubframe; and/or

if the adjacent subframe is a previous subframe of the third uplinksubframe, the M symbols are the last M OFDM symbols in the previoussubframe.

With reference to any one of the fourth to the seventh possibleimplementations of the fourth aspect, in an eighth possibleimplementation, the second uplink signal is an uplink reference signalor a preamble.

With reference to any one of the fourth aspect, or the first to theeighth possible implementations of the fourth aspect, in a ninthpossible implementation, the processing module is specificallyconfigured to:

if determining that a power sum of the terminal device for sending thesecond uplink subframe on all the carriers in the second carrier set isgreater than a maximum transmit power of the terminal device, determinethat the terminal device cancels sending of the K OFDM symbols.

With reference to any one of the fourth aspect, or the first to theeighth possible implementations of the fourth aspect, in a tenthpossible implementation, the processing module is specificallyconfigured to:

when a quantity of carriers included in the second carrier set isgreater than a quantity of uplink carriers that can be simultaneouslysent by the terminal device, determine that the terminal device cancelssending of the K OFDM symbols.

With reference to any one of the fourth aspect, or the first to thetenth possible implementations of the fourth aspect, in an eleventhpossible implementation, the first uplink signal includes an uplinkreference signal and/or a preamble.

With reference to the eighth or the eleventh possible implementation ofthe fourth aspect, in a twelfth possible implementation, the uplinkreference signal is a sounding reference signal SRS.

According to a fifth aspect, an embodiment of the present disclosureprovides an uplink sending method, applied to a carrier aggregationsystem and including:

selecting, by a terminal device, one or more carriers from a firstcarrier set for a first uplink subframe, where the first carrier setincludes all carriers in carrier aggregation that are used by theterminal device to send the first uplink subframe; and

canceling, by the terminal device, sending of the first uplink subframeon the selected one or more carriers, where

the selected one or more carriers are normal carriers or specialcarriers; and

the special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

With reference to the fifth aspect, in a first possible implementation,the selecting, by a terminal device, one or more carriers from a firstcarrier set includes:

when a power sum of the terminal device for sending the first uplinksubframe on all the carriers in the first carrier set is greater than amaximum transmit power of the terminal device, selecting the one or morecarriers from the first carrier set; and

a power sum of the terminal device for sending the first uplink subframeon carriers other than the selected one or more carriers in the firstcarrier set is not greater than the maximum transmit power of theterminal device.

With reference to the fifth aspect, in a second possible implementation,the selecting, by a terminal device, one or more carriers from a firstcarrier set includes:

when a quantity of carriers included in the first carrier set of theterminal device is greater than a quantity of uplink carriers that canbe simultaneously sent by the terminal device, selecting the one or morecarriers from the first carrier set; and

a quantity of carriers that is obtained by subtracting the one or morecarriers from the quantity of carriers included in the first carrier setis not greater than the quantity of uplink carriers that can besimultaneously sent by the terminal device.

With reference to the fifth aspect, or the first or the second possibleimplementation of the fifth aspect, in a third possible implementation,the special carrier is a carrier on which the terminal device sends onlyan uplink signal in uplink, and the uplink signal includes an uplinkreference signal and/or a preamble.

With reference to the third possible implementation of the fifth aspect,in a fourth possible implementation, the uplink reference signal is asounding reference signal SRS.

According to a sixth aspect, an embodiment of the present disclosureprovides an uplink receiving method, applied to a carrier aggregationsystem and including:

determining, by a network device, that a terminal device cancels sendingof a first uplink subframe on one or more carriers in a first carrierset, where the first carrier set includes all carriers in carrieraggregation that are used by the terminal device to send the firstuplink subframe; and

canceling, by the network device, receiving of the first uplink subframeon the one or more carriers, where

the one or more carriers are normal carriers or special carriers; and

the special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

With reference to the sixth aspect, in a first possible implementation,the determining, by a network device, that a terminal device cancelssending of a first uplink subframe on one or more carriers in a firstcarrier set includes:

if determining that a power sum of the terminal device for sending thefirst uplink subframe on all the carriers in the first carrier set isgreater than a maximum transmit power of the terminal device,determining, by the network device, that the terminal device cancelssending of the first uplink subframe on the one or more carriers in thefirst carrier set.

With reference to the sixth aspect, in a second possible implementation,the determining, by a network device, that a terminal device cancelssending of a first uplink subframe on one or more carriers in a firstcarrier set includes:

when a quantity of carriers included in the first carrier set is greaterthan a quantity of uplink carriers that can be simultaneously sent bythe terminal device, determining, by the network device, that theterminal device cancels sending of the first uplink subframe on the oneor more carriers in the first carrier set.

With reference to the sixth aspect, or the first or the second possibleimplementation of the sixth aspect, in a third possible implementation,the special carrier is a carrier on which the terminal device sends onlyan uplink signal in uplink, and the uplink signal includes an uplinkreference signal and/or a preamble.

With reference to the third possible implementation of the sixth aspect,in a fourth possible implementation, the uplink reference signal is asounding reference signal SRS.

According to a seventh aspect, an embodiment of the present disclosureprovides an uplink sending method, applied to a carrier aggregationsystem and including:

determining, by a terminal device, to cancel sending of K consecutiveorthogonal frequency division multiplexing OFDM symbols in a seconduplink subframe, where

the K OFDM symbols are located on one or more normal carriers in asecond carrier set, the second carrier set includes all carriers incarrier aggregation that are used by the terminal device to send thesecond uplink subframe, and K is a positive integer and is not greaterthan a quantity of OFDM symbols included in the second uplink subframe;and

sending, by the terminal device, a first uplink signal in the K symbolson one or more special carriers in the second carrier set, where

the special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

With reference to the seventh aspect, in a first possibleimplementation, a length of the K symbols is not less than a sum offirst duration and second duration;

the first duration is duration required for sending the first uplinksignal; and

the second duration is duration in which the terminal device is switchedbetween carriers.

With reference to the first possible implementation of the seventhaspect, in a second possible implementation, the one or more normalcarriers in the second carrier set belong to a first timing advancegroup TAG 1, and the one or more special carriers in the second carrierset belong to a second timing advance group TAG 2; and

the length of the K symbols is not less than a sum of the firstduration, the second duration, and the third duration, and the thirdduration is a length that is agreed on in advance according to a TAdifference between the TAG 1 and the TAG 2.

With reference to the seventh aspect, or the first or the secondpossible implementation of the seventh aspect, in a third possibleimplementation, the K symbols are the last K OFDM symbols in the seconduplink subframe.

With reference to any one of the seventh aspect, or the first to thethird possible implementations of the seventh aspect, in a fourthpossible implementation, the method further includes:

sending, by the terminal device, a second uplink signal in a thirduplink subframe on the one or more special carriers in a third carrierset, where the third carrier set includes all carriers in carrieraggregation that are used by the terminal device to send the thirduplink subframe; and

determining, by the terminal device, to cancel sending of M consecutiveOFDM symbols of an adjacent subframe of the third uplink subframe, wherethe adjacent subframe is also an uplink subframe, where

the M OFDM symbols are located on one or more normal carriers in thethird carrier set, and M is a positive integer and is not greater than aquantity of OFDM symbols included in the adjacent subframe.

With reference to the fourth possible implementation of the seventhaspect, in a fifth possible implementation, a length of the M OFDMsymbols is not less than the fourth duration; and

the fourth duration is duration in which the terminal device is switchedbetween carriers.

With reference to the fifth possible implementation of the seventhaspect, in a sixth possible implementation, the one or more normalcarriers in the third carrier set belong to a third timing advance groupTAG 3, and the one or more special carriers in the third carrier setbelong to a fourth timing advance group TAG 4; and

the length of the K symbols is not less than a sum of the fourthduration and fifth duration, and the fifth duration is a length that isagreed on in advance according to a TA difference between the TAG 3 andthe TAG 4.

With reference to any one of the fourth to the sixth possibleimplementations of the seventh aspect, in a seventh possibleimplementation,

if the adjacent subframe is a next subframe of the third uplinksubframe, the M symbols are the first M OFDM symbols in the nextsubframe; and/or

if the adjacent subframe is a previous subframe of the third uplinksubframe, the M symbols are the last M OFDM symbols in the previoussubframe.

With reference to any one of the fourth to the seventh possibleimplementations of the seventh aspect, in an eighth possibleimplementation, the second uplink signal includes an uplink referencesignal and/or a preamble.

With reference to any one of the seventh aspect, or the first to theeighth possible implementations of the seventh aspect, in a ninthpossible implementation, the determining, by a terminal device, tocancel sending of K OFDM symbols in a second uplink subframe includes:

when a power sum of the terminal device for sending the second uplinksubframe on all the carriers in the second carrier set is greater than amaximum transmit power of the terminal device, determining to cancelsending of the K OFDM symbols; and

a power sum of the terminal device for sending the second uplinksubframe on carriers other than the one or more normal carriers on whichthe K OFDM symbols are located in the second carrier set is not greaterthan the maximum transmit power of the terminal device.

With reference to any one of the seventh aspect, or the first to theeighth possible implementations of the seventh aspect, in a tenthpossible implementation, the determining, by a terminal device, tocancel sending of K OFDM symbols in a second uplink subframe includes:

when a quantity of carriers included in the second carrier set of theterminal device is greater than a quantity of uplink carriers that canbe simultaneously sent by the terminal device, canceling sending of theK OFDM symbols; and

a quantity of carriers that is obtained by subtracting the one or morenormal carriers on which the K OFDM symbols are located from thequantity of carriers included in the second carrier set is not greaterthan the quantity of uplink carriers that can be simultaneously sent bythe terminal device.

With reference to any one of the seventh aspect, or the first to thetenth possible implementations of the seventh aspect, in an eleventhpossible implementation, the first uplink signal includes an uplinkreference signal and/or a preamble.

With reference to the eighth or the eleventh possible implementation ofthe seventh aspect, in a twelfth possible implementation, the uplinkreference signal is a sounding reference signal SRS.

According to an eighth aspect, an embodiment of the present disclosureprovides an uplink receiving method, applied to a carrier aggregationsystem and including:

determining, by a network device, that a terminal device cancels sendingof K consecutive orthogonal frequency division multiplexing OFDM symbolsin a second uplink subframe, and determining that the terminal devicesends a first uplink signal in the K symbols on one or more specialcarriers in the second carrier set, where

the K OFDM symbols are located on one or more normal carriers in thesecond carrier set, the second carrier set includes all carriers incarrier aggregation that are used by the terminal device to send thesecond uplink subframe, and K is a positive integer and is not greaterthan a quantity of OFDM symbols included in the second uplink subframe;and

canceling, by the network device, receiving of the K OFDM symbols, andreceiving the second uplink signal in the K symbols on the one or morespecial carriers in the second carrier set, where

the special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

With reference to the eighth aspect, in a first possible implementation,a length of the K symbols is not less than a sum of first duration andsecond duration;

the first duration is duration required for sending the first uplinksignal; and

the second duration is duration in which the terminal device is switchedbetween carriers.

With reference to the first possible implementation of the eighthaspect, in a second possible implementation, the one or more normalcarriers in the second carrier set belong to a first timing advancegroup TAG 1, and the one or more special carriers in the second carrierset belong to a second timing advance group TAG 2; and

the length of the K symbols is not less than a sum of the firstduration, the second duration, and the third duration, and the thirdduration is a length that is agreed on in advance according to a TAdifference between the TAG 1 and the TAG 2.

With reference to the eighth aspect, or the first or the second possibleimplementation of the eighth aspect, in a third possible implementation,the K symbols are the last K OFDM symbols in the second uplink subframe.

With reference to any one of the eighth aspect, or the first to thethird possible implementations of the eighth aspect, in a fourthpossible implementation, the method further includes:

determining, by the network device, that the terminal device sends asecond uplink signal in a third uplink subframe on the one or morespecial carriers in a third carrier set, and determining that theterminal device cancels sending of M consecutive OFDM symbols of anadjacent subframe of the third uplink subframe, where the adjacentsubframe is also an uplink subframe, and the third carrier set includesall carriers in carrier aggregation that are used by the terminal deviceto send the third uplink subframe; and

receiving, by the network device, the second uplink signal on the one ormore special carriers in the third carrier set, and canceling receivingof the M consecutive OFDM symbols in the adjacent subframe of the thirduplink subframe, where

the M OFDM symbols are located on one or more normal carriers in thethird carrier set, and M is a positive integer and is not greater than aquantity of OFDM symbols included in the adjacent subframe.

With reference to the fourth possible implementation of the eighthaspect, in a fifth possible implementation, a length of the M OFDMsymbols is not less than the fourth duration; and

the fourth duration is duration in which the terminal device is switchedbetween carriers.

With reference to the fifth possible implementation of the eighthaspect, in a sixth possible implementation, the one or more normalcarriers in the third carrier set belong to a third timing advance groupTAG 3, and the one or more special carriers in the third carrier setbelong to a fourth timing advance group TAG 4; and

the length of the K symbols is not less than a sum of the fourthduration and fifth duration, and the fifth duration is a length that isagreed on in advance according to a TA difference between the TAG 3 andthe TAG 4.

With reference to any one of the fourth to the sixth possibleimplementations of the eighth aspect, in a seventh possibleimplementation,

if the adjacent subframe is a next subframe of the third uplinksubframe, the M symbols are the first M OFDM symbols in the nextsubframe; and/or

if the adjacent subframe is a previous subframe of the third uplinksubframe, the M symbols are the last M OFDM symbols in the previoussubframe.

With reference to any one of the fourth to the seventh possibleimplementations of the eighth aspect, in an eighth possibleimplementation, the second uplink signal is an uplink reference signalor a preamble.

With reference to any one of the eighth aspect, or the first to theeighth possible implementations of the eighth aspect, in a ninthpossible implementation, the determining, by a network device, that aterminal device cancels sending of K OFDM symbols in a second uplinksubframe includes:

if determining that a power sum of the terminal device for sending thesecond uplink subframe on all the carriers in the second carrier set isgreater than a maximum transmit power of the terminal device,determining, by the network device, that the terminal device cancelssending of the K OFDM symbols.

With reference to any one of the eighth aspect, or the first to theeighth possible implementations of the eighth aspect, in a tenthpossible implementation, the determining, by a network device, that aterminal device cancels sending of K OFDM symbols in a second uplinksubframe includes:

when a quantity of carriers included in the second carrier set isgreater than a quantity of uplink carriers that can be simultaneouslysent by the terminal device, determining, by the network device, thatthe terminal device cancels sending of the K OFDM symbols.

With reference to any one of the eighth aspect, or the first to thetenth possible implementations of the eighth aspect, in an eleventhpossible implementation, the first uplink signal includes an uplinkreference signal and/or a preamble.

With reference to the eighth or the eleventh possible implementation ofthe eighth aspect, in a twelfth possible implementation, the uplinkreference signal is a sounding reference signal SRS.

In embodiments of the present disclosure, the terminal device rejects anuplink subframe on some carriers or some ODFM symbols of an uplinksubframe, thereby resolving a problem that information such as downlinkchannel characteristics of some carriers cannot be obtained when nouplink reference signal (such as an SRS) is sent on these carriers. Inaddition, a conflict is avoided.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram of a principle of carrier aggregation;

FIG. 2 is a schematic diagram of an SRS sending manner in an LTE CAsystem;

FIG. 3 is a schematic diagram of an uplink SRS only carrier in an LTE CAsystem;

FIG. 4 is a schematic diagram in which simultaneous uplink sending on anormal carrier and a special carrier exceeds an uplink sendingcapability of UE;

FIG. 5 is a schematic structural diagram of a wireless communicationssystem according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram in which simultaneous uplink sending on anormal carrier and a special carrier exceeds an uplink sendingcapability of UE;

FIG. 7 is a schematic diagram of canceling sending of an uplink subframeon some carriers according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of rejecting some orthogonal frequencydivision multiplexing (OFDM) symbols on a normal carrier according to anembodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a first terminal deviceaccording to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of a first network deviceaccording to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of a second terminal deviceaccording to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of a second network deviceaccording to an embodiment of the present disclosure;

FIG. 13 is a flowchart of a first method for sending an uplink signalaccording to an embodiment of the present disclosure;

FIG. 14 is a flowchart of a first method for receiving an uplink signalaccording to an embodiment of the present disclosure;

FIG. 15 is a flowchart of a second method for sending an uplink signalaccording to an embodiment of the present disclosure; and

FIG. 16 is a flowchart of a second method for receiving an uplink signalaccording to an embodiment of the present disclosure.

DESCRIPTION OF EMBODIMENTS

Generally, in an LTE CA system, a quantity of uplink carriers that canbe simultaneously sent by UE is limited. According to this limiteduplink sending capability, to obtain, for example, the downlink channelcharacteristics of the remaining three carriers in FIG. 2, a pluralityof uplink carriers may be configured for the UE for simultaneoussending. A quantity of the configured plurality of uplink carriersexceeds a maximum quantity of uplink carriers that can be simultaneouslysent by the UE. The UE sends an SRS on different uplink carriers in atime division manner. In this case, an uplink sending capability of theUE is not exceeded at a sending moment. For example, an SRS is sent on acarrier 1 and a carrier 2 at a moment 1 shown in FIG. 3, and an SRS issent on a carrier 3 and a carrier 4 at a moment 2.

If neither uplink data such as a physical uplink shared channel (PUSCH)nor uplink control information such as a physical uplink control channel(PUCCH) is sent in an uplink subframe on the carrier 3 and the carrier4, the two carriers are referred to as special carriers, and othercarriers are referred to as normal carriers.

The uplink data may be uplink physical layer data, including servicedata, higher layer signaling, and the like. The uplink controlinformation is physical layer control information, and physical layeruplink control information may be sent by using the PUCCH.

Optionally, the special carrier may be used to send only an SRS in anuplink subframe. In this case, the special carrier may be referred to asa carrier on which only the SRS is sent in uplink (an uplink SRS onlycarrier). Optionally, the special carrier may be used to send only apreamble in an uplink subframe. In this case, the special carrier may bereferred to as a carrier on which only the preamble is sent in uplink(an uplink Preamble only carrier). Optionally, the special carrier maybe used to send a preamble and an SRS in an uplink subframe.

The normal carrier may be used to send uplink control information and/oruplink data in an uplink subframe. In addition, the normal carrier maybe used to send an uplink signal such as an SRS or a preamble in theuplink subframe.

As shown in FIG. 4, the carrier 1 and the carrier 2 are normal carriers,and the carrier 3 is a special carrier. The uplink sending capability ofthe UE is to simultaneously send a maximum of two uplink carriers.

In a same uplink subframe, when an SRS is sent on the carrier 3, and anSRS and a PUCCH are sent on the carrier 2, if the UE receives uplinkscheduling and needs to send a PUSCH in the uplink subframe on thecarrier 1, or the UE needs to send a PUCCH in the uplink subframe on thecarrier 1 (uplink sending such as PUSCH sending and/or PUCCH sending isreferred to as “uplink normal sending”), the uplink sending capabilityof the UE is exceeded.

In this case, simultaneous uplink sending on the normal carrier and thespecial carrier may exceed the uplink sending capability of the UE. Thiscase is referred to as a “conflict”.

In the embodiments of the present disclosure, a terminal device rejectsan uplink subframe on some carriers or some ODFM symbols of an uplinksubframe on some carriers, thereby resolving the problem thatinformation such as downlink channel characteristics of some carrierscannot be obtained when no uplink reference signal (such as an SRS) issent on these carriers. In addition, a conflict is avoided. Thefollowing provides detailed descriptions with reference to theaccompanying drawings.

In the embodiments of the present disclosure, the terms “system” and“network” may be used interchangeably in this specification. The term“and/or” in this specification describes only an associationrelationship for describing associated objects and represents that threerelationships may exist. For example, A and/or B may represent thefollowing three cases: Only A exists, both A and B exist, and only Bexists. In addition, the character “/” in this specification generallyindicates an “or” relationship between the associated objects.

FIG. 5 is a schematic structural diagram of a wireless communicationssystem according to an embodiment of the present disclosure. As shown inFIG. 5, the system includes a terminal device 501 and a network device502. The terminal device 501 is configured to perform uplink sending,and the network device 502 is configured to perform uplink receiving.

A communications standard of the wireless communications system shown inFIG. 5 includes but is not limited to a Global System for MobileCommunications (GSM), Code Division Multiple Access (CDMA) IS-95, CodeDivision Multiple Access (CDMA) 2000, Time Division-Synchronous CodeDivision Multiple Access (TD-SCDMA), Wideband Code Division MultipleAccess (WCDMA), Time Division Duplex-Long Term Evolution (TDD LTE),Frequency Division Duplex-Long Term Evolution (FDD LTE), Long TermEvolution Advanced (LTE-advanced), a personal handy-phone system (PHS),Wireless Fidelity (WiFi) specified in the 802.11 family of protocols,Worldwide Interoperability for Microwave Access (WiMAX), and variousevolved wireless communications systems in future.

This embodiment of the present disclosure can be applied to any wirelesscommunications system supporting carrier aggregation of simultaneousuplink sending on a plurality of carriers, to resolve the problem thatinformation such as downlink channel characteristics of some carrierscannot be obtained when no uplink reference signal is sent on thesecarriers. In addition, the following problem can be avoided:Simultaneous uplink sending on a normal carrier and a special carriermay exceed an uplink sending capability of a terminal device.

The terminal device 501 may be a wireless terminal. The wirelessterminal may be a device that provides a user with voice and/or dataconnectivity, a handheld device with a wireless connection function, oranother processing device connected to a wireless modem. The wirelessterminal may communicate with one or more core networks by using a radioaccess network. The wireless terminal may be a mobile terminal, such asa mobile phone (or referred to as a “cellular” phone) and a computerwith a mobile terminal. For example, the wireless terminal may be aportable, pocket-sized, handheld, computer built-in, or in-vehiclemobile apparatus that exchanges voice and/or data with the radio accessnetwork. For example, the wireless terminal may be a device such as apersonal communications service (PCS) phone, a cordless telephone set, aSession Initiation Protocol (SIP) phone, a wireless local loop (WLL)station, or a personal digital assistant (PDA). The wireless terminalmay also be referred to as a subscriber unit, a subscriber station, amobile station, a mobile station, a remote station, an access point, aremote terminal, an access terminal, a user terminal, a user agent, auser device, or user equipment.

The network device 502 may include a base station or a radio resourcemanagement device for controlling the base station; or may include abase station and a radio resource management for controlling the basestation. The base station may be a macro base station, or a micro basestation such as a small cell base station or a pico cell base station.The base station may be a home base station, such as a home NodeB (HNB)or a home evolved NodeB (HeNB). The base station may include a relaynode (relay) and the like.

For example, for an LTE system such as a TDD LTE system or an LTE-Asystem, the network device 502 in the wireless communications systemprovided in this embodiment of the present disclosure may be an evolvedNodeB (eNodeB), and the terminal device 501 may be UE. For a TD-SCDMAsystem, the network device 502 in the wireless communications systemprovided in this embodiment of the present disclosure may include aNodeB and/or a radio network controller (RNC), and the terminal device501 may be UE.

This embodiment of the present disclosure provides a plurality ofsolutions including the following two optional solutions, to resolve aproblem that information such as downlink channel characteristics ofsome carriers cannot be obtained when no uplink reference signal (suchas an SRS) is sent on these carriers. In addition, a conflict isavoided. The following separately describes the two solutions in detail.

Optional Solution 1

In optional solution 1, the terminal device 501 selects one or morecarriers from a carrier set for an uplink subframe. The carrier setincludes all carriers in carrier aggregation that are used by theterminal device 501 to send the uplink subframe. The terminal device 501cancels sending of the uplink subframe on the selected one or morecarriers. The selected one or more carriers are normal carriers orspecial carriers.

Uplink sending of an uplink subframe is canceled on some normal carriersor special carriers, so that a conflict caused because simultaneousuplink sending on the normal carrier and the special carrier exceeds anuplink sending capability of the terminal device 501 can be avoided.

When one of the following conditions is met, the terminal device 501 mayselect the one or more carriers from the carrier set, and cancel sendingof the uplink subframe on the carriers.

Condition 1

A power sum of the terminal device 501 for sending the uplink subframeon all the carriers in the carrier set is greater than a maximumtransmit power of the terminal device 501.

When condition 1 is met, the terminal device 501 may cancel sending ofthe uplink subframe on the one or more carriers in the carrier set, sothat the following case exists:

A power sum of the terminal device 501 for sending the uplink subframeon carriers other than the selected one or more carriers in the carrierset is not greater than the maximum transmit power of the terminaldevice 501.

Condition 2

A quantity of carriers included in the carrier set is greater than aquantity of uplink carriers that can be simultaneously sent by theterminal device 501.

When condition 2 is met, the terminal device 501 cancels sending of theuplink subframe on the one or more carriers in the carrier set, so thatthe following case exists:

A quantity of carriers that is obtained by subtracting the selected oneor more carriers from the quantity of carriers included in the carrierset is not greater than the quantity of uplink carriers that can besimultaneously sent by the terminal device 501.

Correspondingly, the network device 502 may use a same determiningcondition as the terminal device 501, for example, condition 1 orcondition 2, to determine that the terminal device 501 cancels sendingof the uplink subframe on the one or more carriers in the carrier set.In this case, the network device 502 cancels receiving of the uplinksubframe on the one or more carriers.

The terminal device 501 and the network device 502 may use a same ruleto determine a specific carrier that the terminal device 501 rejects.Because the network device 502 knows a carrier that is used by theterminal device 501 for uplink sending, based on the same rule, thenetwork device 502 may know a carrier that the terminal device 501rejects. The rule may be any one of the following rules:

1. preferentially rejecting a carrier with a low carrier priority;

2. preferentially rejecting a carrier with a small carrier sequencenumber;

3. preferentially rejecting a carrier with a large carrier sequencenumber; or

4. preferentially rejecting a high-frequency carrier.

As described above, the special carrier is a carrier on which theterminal device 501 sends neither uplink data nor uplink controlinformation in uplink. In this case, the terminal device 501 may sendonly an uplink signal on the special carrier. The uplink signal may bean uplink reference signal or a preamble. Optionally, the uplinkreference signal may be an SRS.

Optional Solution 2

In optional solution 2, the terminal device 501 determines to cancelsending of one or more consecutive OFDM symbols of an uplink subframe,and the OFDM symbols that are rejected are located on one or more normalcarriers in a carrier set.

The following separately describes two cases.

Case 1

As shown in FIG. 6, if an uplink sending capability of the terminaldevice 501 is to simultaneously send a maximum of two uplink carriers, aconflict may occur between SRS sending on a carrier 4 and a carrier 5and uplink normal sending on a carrier 1 and a carrier 2.

In this case, as shown in FIG. 7, uplink sending of some OFDM symbols onnormal carriers such as the carrier 1 and the carrier 2 may be canceled,so as to ensure that in a time period in which an SRS is sent on thecarrier 4 and the carrier 5, sending is performed only on the carrier 4and the carrier 5, and the uplink sending capability of the terminaldevice 501 is not exceeded.

Therefore, in case 1, the terminal device 501 cancels sending of Kconsecutive OFDM symbols of an uplink subframe. The K OFDM symbols arelocated on one or more normal carriers in a carrier set. The carrier setincludes all carriers in carrier aggregation that are used by theterminal device 501 to send the uplink subframe. K is a positive integerand is not greater than a quantity of OFDM symbols included in theuplink subframe. The terminal device 501 sends an uplink signal in the Ksymbols on one or more special carriers in the carrier set.

In FIG. 7, the terminal device 501 cancels sending of the K OFDM symbolsin the uplink subframe on all normal carriers. Optionally, if an SRS issent only on the carrier 4, and no SRS is sent on the carrier 5, sendingof the uplink subframe may be canceled only on some normal carriers. Forexample, sending of the K OFDM symbols in the uplink subframe iscanceled on the carrier 1 or carrier 2, and the uplink sendingcapability of the terminal device 501 is not exceeded.

Sending of some OFDM symbols is canceled on the normal carrier, so thata conflict caused because simultaneous uplink sending on the normalcarrier and the special carrier exceeds the uplink sending capability ofthe terminal device 501 can be avoided.

Optionally, a length of the K symbols is not less than a sum of firstduration and second duration. For example, the length of the K symbolsis equal to the sum of the first duration and the second duration. Foranother example, the length of the K symbols is greater than the sum ofthe first duration and the second duration.

The first duration is duration required for sending the uplink signal;and

the second duration is duration in which the terminal device 501 isswitched between carriers.

If the terminal device 501 supports the normal carrier and the specialcarrier by using different hardware such as radio-frequency links thatdo not affect each other, the duration in which the terminal device 501is switched between carriers may be 0. If hardware by which the terminaldevice 501 supports the normal carrier and the special carrier affectseach other, the duration in which the terminal device 501 is switchedbetween carriers is usually greater than 0.

Optionally, a possible case is as follows: If the one or more normalcarriers on which sending of the uplink subframe is canceled belong to atiming advance group (TAG), and the one or more special carriers onwhich the uplink signal is sent belong to another TAG the length of theK symbols may be determined according to a TA difference between the twoTAGs. Because a TA difference between two TAGs is usually not greaterthan one symbol, when the length of the K symbols is set, the firstduration and the second duration are considered, and sending of one ortwo OFDM symbols may be considered to be additionally canceled.

Optionally, if the uplink signal is located in the last several OFDMsymbols in the uplink subframe, the K symbols may be the last K OFDMsymbols in the uplink subframe.

Optionally, if the uplink signal is located in the first several OFDMsymbols in the uplink subframe or is located in the entire subframe, theK symbols may be the last K OFDM symbols of a previous subframe of theuplink subframe.

Optionally, when one of the following conditions is met, the terminaldevice 501 may determine to cancel sending of the K consecutive OFDMsymbols in the uplink subframe:

Condition 1

A power sum of the terminal device 501 for sending the uplink subframeon all the carriers in the carrier set is greater than a maximumtransmit power of the terminal device 501.

When condition 1 is met, the terminal device 501 may cancel sending ofthe K consecutive OFDM symbols in the uplink subframe, so that thefollowing case exists:

A power sum of the terminal device 501 for sending the uplink subframeon carriers other than the one or more normal carriers on which the KOFDM symbols are located in the carrier set is not greater than themaximum transmit power of the terminal device 501.

Condition 2

A quantity of carriers included in the carrier set is greater than aquantity of uplink carriers that can be simultaneously sent by theterminal device 501.

When condition 2 is met, the terminal device 501 may cancel sending ofthe K consecutive OFDM symbols in the uplink subframe, so that thefollowing case exists:

A quantity of carriers that is obtained by subtracting the one or morenormal carriers on which the K OFDM symbols are located from thequantity of carriers included in the carrier set is not greater than thequantity of uplink carriers that can be simultaneously sent by theterminal device 501.

Correspondingly, the network device 502 may use a same determiningcondition as the terminal device 501, for example, condition 1 orcondition 2, to determine that the terminal device 501 cancels sendingof the K consecutive OFDM symbols in the uplink subframe. In this case,the network device 502 cancels receiving of the K consecutive OFDMsymbols in the uplink subframe.

The terminal device 501 and the network device 502 may use a same ruleto determine a specific carrier that the terminal device 501 rejects.Because the network device 502 knows a carrier that is used by theterminal device 501 for uplink sending, based on the same rule, thenetwork device 502 may know a carrier that the terminal device 501rejects. The rule may be any one of the following rules:

1. preferentially rejecting a carrier with a low carrier priority;

2. preferentially rejecting a carrier with a small carrier sequencenumber;

3. preferentially rejecting a carrier with a large carrier sequencenumber; or

4. preferentially rejecting a high-frequency carrier.

A rule for defining a value of K may be agreed on in advance between thenetwork device 502 and the terminal device 501.

For example, if the duration required for sending the uplink signal isone symbol, and the duration in which the terminal device 501 isswitched between carriers is less than one symbol, the network device502 and the terminal device 501 may agree on the following case inadvance: If the terminal device 501 supports the normal carrier and thespecial carrier by using different hardware such as radio-frequencylinks that do not affect each other, the value of K is 1 (because theduration in which the terminal device 501 is switched between carriersis 0); or if hardware by which the terminal device 501 supports thenormal carrier and the special carrier affects each other, the value ofK is 2.

Case 2

As shown in FIG. 8, the terminal device 501 is switched from a specialcarrier to a normal carrier, or is switched from a normal carrier to aspecial carrier. In this case, M OFDM symbols need to be vacated on thenormal carrier, to ensure sending of an uplink signal.

In case 2, the terminal device 501 sends an uplink signal in an uplinksubframe on one or more special carriers in a carrier set. The carrierset includes all carriers in carrier aggregation that are used by theterminal device 501 to send the uplink subframe.

The terminal device 501 determines to cancel sending of M consecutiveOFDM symbols of an adjacent subframe of the uplink subframe, and theadjacent subframe is also an uplink subframe.

The M OFDM symbols are located on one or more normal carriers in thecarrier set, and M is a positive integer and is not greater than aquantity of OFDM symbols included in the adjacent subframe.

Optionally, a length of the M OFDM symbols is not less than duration inwhich the terminal device 501 is switched between carriers.

If the terminal device 501 supports the normal carrier and the specialcarrier by using different hardware such as radio-frequency links thatdo not affect each other, the duration in which the terminal device 501is switched between carriers may be 0. If hardware by which the terminaldevice 501 supports the normal carrier and the special carrier affectseach other, the duration in which the terminal device 501 is switchedbetween carriers is usually greater than 0.

Optionally, a possible case is as follows: If the one or more normalcarriers on which sending of the uplink subframe is canceled belong to aTAG, and the one or more special carriers on which the uplink signal issent belong to another TAG, the length of the K symbols may bedetermined according to a TA difference between the two TAGs.

Optionally, if the adjacent subframe is a next subframe of the uplinksubframe, the M symbols may be the first M OFDM symbols in the nextsubframe; or

if the adjacent subframe is a previous subframe of the uplink subframe,the M symbols may be the last M OFDM symbols in the previous subframe.

The terminal device 501 and the network device 502 may use a same ruleto determine a specific carrier that the terminal device 501 rejects.Because the network device 502 knows a carrier that is used by theterminal device 501 for uplink sending, based on the same rule, thenetwork device 502 may know a carrier that the terminal device 501rejects. The rule may be any one of the following rules:

1. preferentially rejecting a carrier with a low carrier priority;

2. preferentially rejecting a carrier with a small carrier sequencenumber;

3. preferentially rejecting a carrier with a large carrier sequencenumber; or

4. preferentially rejecting a high-frequency carrier.

A rule for defining a value of M may be agreed on in advance between thenetwork device 502 and the terminal device 501.

For example, if the duration in which the terminal device 501 isswitched between carriers is less than one symbol, and the networkdevice 502 and the terminal device 501 may agree on the following casein advance:

If the terminal device 501 supports the normal carrier and the specialcarrier by using different hardware such as radio-frequency links thatdo not affect each other, the value of M is 0 (because the duration inwhich the terminal device 501 is switched between carriers is 0); or ifhardware by which the terminal device 501 supports the normal carrierand the special carrier affects each other, the value of M is 1.

In case 1 and case 2, the uplink signal sent by the terminal device 501is an uplink reference signal or a preamble. Optionally, the uplinkreference signal is an SRS.

FIG. 9 is a schematic structural diagram of a first terminal deviceaccording to an embodiment of the present disclosure. As shown in FIG.9, the terminal device includes:

a processing module 901, configured to select one or more carriers froma first carrier set for a first uplink subframe, where the first carrierset includes all carriers in carrier aggregation that are used by theterminal device to send the first uplink subframe; and

a sending module 902, configured to cancel sending of the first uplinksubframe on the one or more carriers selected by the processing module901.

The one or more carriers selected by the processing module 901 arenormal carriers or special carriers.

The special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

Optionally, the processing module 901 is specifically configured to:

when a power sum of the terminal device for sending the first uplinksubframe on all the carriers in the first carrier set is greater than amaximum transmit power of the terminal device, select the one or morecarriers from the first carrier set; and

a power sum of the terminal device for sending the first uplink subframeon carriers other than the selected one or more carriers in the firstcarrier set is not greater than the maximum transmit power of theterminal device.

Optionally, the processing module 901 is specifically configured to:

when a quantity of carriers included in the first carrier set of theterminal device is greater than a quantity of uplink carriers that canbe simultaneously sent by the terminal device, select the one or morecarriers from the first carrier set; and

a quantity of carriers that is obtained by subtracting the one or morecarriers from the quantity of carriers included in the first carrier setis not greater than the quantity of uplink carriers that can besimultaneously sent by the terminal device.

Optionally, the special carrier is a carrier on which the terminaldevice sends only an uplink signal in uplink, and the uplink signalincludes an uplink reference signal and/or a preamble.

Optionally, the uplink reference signal is a sounding reference signalSRS.

For a communications standard of a wireless communications system inwhich the terminal device is located, refer to the wirelesscommunications system shown in FIG. 5. For various types of the terminaldevice, refer to the type of the terminal device 501.

For another optional implementation of the processing module 901, referto the solution in which the terminal device 501 performs controlprocessing in optional solution 1 of the wireless communications systemshown in FIG. 5. For another optional implementation of the sendingmodule 902, refer to the solution in which the terminal device 501performs sending in optional solution 1 of the wireless communicationssystem shown in FIG. 5.

For a condition that is used by the processing module 901 to select acarrier on which sending of an uplink subframe is canceled, refer tocondition 1 and condition 2 in optional solution 1 of the wirelesscommunications system shown in FIG. 5. For a rule in which theprocessing module 901 selects a carrier on which sending is canceled,refer to the selection rule in optional solution 1 of the wirelesscommunications system shown in FIG. 5.

The processing module 901 may be implemented by one or more processors,and the sending module 902 may be implemented by one or moretransmitters.

FIG. 10 is a schematic structural diagram of a first network deviceaccording to an embodiment of the present disclosure. As shown in FIG.10, the network device includes:

a processing module 1001, configured to determine that a terminal devicecancels sending of a first uplink subframe on one or more carriers in afirst carrier set, where the first carrier set includes all carriers incarrier aggregation that are used by the terminal device to send thefirst uplink subframe; and

a receiving module 1002, configured to cancel receiving of the firstuplink subframe on the one or more carriers.

The one or more carriers are normal carriers or special carriers.

The special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

Optionally, the processing module 1001 is specifically configured to:

if determining that a power sum of the terminal device for sending thefirst uplink subframe on all the carriers in the first carrier set isgreater than a maximum transmit power of the terminal device, determinethat the terminal device cancels sending of the first uplink subframe onthe one or more carriers in the first carrier set.

Optionally, the processing module 1001 is specifically configured to:

when a quantity of carriers included in the first carrier set is greaterthan a quantity of uplink carriers that can be simultaneously sent bythe terminal device, determine that the terminal device cancels sendingof the first uplink subframe on the one or more carriers in the firstcarrier set.

Optionally, the special carrier is a carrier on which the terminaldevice sends only an uplink signal in uplink, and the uplink signalincludes an uplink reference signal and/or a preamble.

Optionally, the uplink reference signal is a sounding reference signalSRS.

For a communications standard of a wireless communications system inwhich the network device is located, refer to the wirelesscommunications system shown in FIG. 5. For various types of the networkdevice, refer to the type of the network device 502.

For another optional implementation of the processing module 1001, referto the solution in which the network device 502 performs controlprocessing in optional solution 1 of the wireless communications systemshown in FIG. 5. For another optional implementation of the receivingmodule 1002, refer to the solution in which the network device 502performs receiving in optional solution 1 of the wireless communicationssystem shown in FIG. 5.

For a condition that is used by the processing module 1001 to determinethat the terminal device cancels sending of an uplink subframe on acarrier, refer to condition 1 and condition 2 in optional solution 1 ofthe wireless communications system shown in FIG. 5. For a rule in whichthe network device 502 determines a carrier on which the terminal device501 cancels sending, refer to the rule in optional solution 1 of thewireless communications system shown in FIG. 5.

The processing module 1001 may be implemented by one or more processors,and the receiving module 1002 may be implemented by one or morereceivers.

FIG. 11 is a schematic structural diagram of a second terminal deviceaccording to an embodiment of the present disclosure. As shown in FIG.11, the terminal device includes:

a processing module 1101, configured to determine that the terminaldevice cancels sending of K consecutive orthogonal frequency divisionmultiplexing OFDM symbols in a second uplink subframe, where

the K OFDM symbols are located on one or more normal carriers in asecond carrier set, the second carrier set includes all carriers incarrier aggregation that are used by the terminal device to send thesecond uplink subframe, and K is a positive integer and is not greaterthan a quantity of OFDM symbols included in the second uplink subframe;and

a sending module 1102, configured to send a first uplink signal in the Ksymbols on one or more special carriers in the second carrier set.

The special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

Optionally, a length of the K symbols is not less than a sum of firstduration and second duration.

The first duration is duration required for sending the first uplinksignal.

The second duration is duration in which the terminal device is switchedbetween carriers.

Optionally, the one or more normal carriers in the second carrier setbelong to a first timing advance group TAG 1, and the one or morespecial carriers in the second carrier set belong to a second timingadvance group TAG 2.

The length of the K symbols is not less than a sum of the firstduration, the second duration, and the third duration, and the thirdduration is a length that is agreed on in advance according to a TAdifference between the TAG 1 and the TAG 2.

Optionally, the K symbols are the last K OFDM symbols in the seconduplink subframe.

Optionally, the sending module 1102 is further configured to: send asecond uplink signal in a third uplink subframe on the one or morespecial carriers in a third carrier set. The third carrier set includesall carriers in carrier aggregation that are used by the terminal deviceto send the third uplink subframe.

The processing module 1101 is further configured to determine that theterminal device cancels sending of M consecutive OFDM symbols of anadjacent subframe of the third uplink subframe. The adjacent subframe isalso an uplink subframe.

The M OFDM symbols are located on one or more normal carriers in thethird carrier set, and M is a positive integer and is not greater than aquantity of OFDM symbols included in the adjacent subframe.

Optionally, a length of the M OFDM symbols is not less than the fourthduration.

The fourth duration is duration in which the terminal device is switchedbetween carriers.

Optionally, the one or more normal carriers in the third carrier setbelong to a third timing advance group TAG 3, and the one or morespecial carriers in the third carrier set belong to a fourth timingadvance group TAG 4.

The length of the K symbols is not less than a sum of the fourthduration and fifth duration, and the fifth duration is a length that isagreed on in advance according to a TA difference between the TAG 3 andthe TAG 4.

Optionally, if the adjacent subframe is a next subframe of the thirduplink subframe, the M symbols are the first M OFDM symbols in the nextsubframe; and/or

if the adjacent subframe is a previous subframe of the third uplinksubframe, the M symbols are the last M OFDM symbols in the previoussubframe.

Optionally, the second uplink signal includes an uplink reference signaland/or a preamble.

Optionally, the processing module 1101 is specifically configured to:

when a power sum of the terminal device for sending the second uplinksubframe on all the carriers in the second carrier set is greater than amaximum transmit power of the terminal device, determine that theterminal device cancels sending of the K OFDM symbols; and

a power sum of the terminal device for sending the second uplinksubframe on carriers other than the one or more normal carriers on whichthe K OFDM symbols are located in the second carrier set is not greaterthan the maximum transmit power of the terminal device.

Optionally, the processing module 1101 is specifically configured to:

when a quantity of carriers included in the second carrier set of theterminal device is greater than a quantity of uplink carriers that canbe simultaneously sent by the terminal device, determine that theterminal device cancels sending of the K OFDM symbols; and

a quantity of carriers that is obtained by subtracting the one or morenormal carriers on which the K OFDM symbols are located from thequantity of carriers included in the second carrier set is not greaterthan the quantity of uplink carriers that can be simultaneously sent bythe terminal device.

Optionally, the first uplink signal includes an uplink reference signaland/or a preamble.

Optionally, the uplink reference signal is a sounding reference signalSRS.

For a communications standard of a wireless communications system inwhich the terminal device is located, refer to the wirelesscommunications system shown in FIG. 5. For various types of the terminaldevice, refer to the type of the terminal device 501.

For another optional implementation of the processing module 1101, referto the solution in which the terminal device 501 performs controlprocessing in optional solution 2 of the wireless communications systemshown in FIG. 5. For another optional implementation of the sendingmodule 1102, refer to the solution in which the terminal device 501performs sending in optional solution 2 of the wireless communicationssystem shown in FIG. 5.

For two cases existing when the processing module 1101 performsprocessing, refer to the two cases in optional solution 2 of thewireless communications system shown in FIG. 5. In case 1, for acondition that is used by the processing module 1101 to select a carrieron which sending of some OFDM symbols is canceled, refer to condition 1and condition 2 in case 1 in optional solution 2 of the wirelesscommunications system shown in FIG. 5. In case 2, which is similar tocase 2 in optional solution 2 of the wireless communications systemshown in FIG. 5, the processing module 1101 may cancel sending of someOFDM symbols on a normal carrier during a switchover between the specialcarrier and the normal carrier. For a rule in which the processingmodule 1101 selects a carrier on which sending is canceled, refer to theselection rule in optional solution 2 of the wireless communicationssystem shown in FIG. 5.

The processing module 1101 may be implemented by one or more processors,and the sending module 1102 may be implemented by one or moretransmitters.

FIG. 12 is a schematic structural diagram of a second network deviceaccording to an embodiment of the present disclosure. As shown in FIG.12, the network device includes:

a processing module 1201, configured to: determine that a terminaldevice cancels sending of K consecutive orthogonal frequency divisionmultiplexing OFDM symbols in a second uplink subframe, and determinethat the terminal device sends a first uplink signal in the K symbols onone or more special carriers in the second carrier set, where

the K OFDM symbols are located on one or more normal carriers in thesecond carrier set, the second carrier set includes all carriers incarrier aggregation that are used by the terminal device to send thesecond uplink subframe, and K is a positive integer and is not greaterthan a quantity of OFDM symbols included in the second uplink subframe;and

a receiving module 1202, configured to: cancel receiving of the K OFDMsymbols, and receive the second uplink signal in the K symbols on theone or more special carriers in the second carrier set.

The special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

Optionally, a length of the K symbols is not less than a sum of firstduration and second duration.

The first duration is duration required for sending the first uplinksignal.

The second duration is duration in which the terminal device is switchedbetween carriers.

Optionally, the one or more normal carriers in the second carrier setbelong to a first timing advance group TAG 1, and the one or morespecial carriers in the second carrier set belong to a second timingadvance group TAG 2.

The length of the K symbols is not less than a sum of the firstduration, the second duration, and the third duration, and the thirdduration is a length that is agreed on in advance according to a TAdifference between the TAG 1 and the TAG 2.

Optionally, the K symbols are the last K OFDM symbols in the seconduplink subframe.

Optionally, the processing module 1201 is further configured to:determine that the terminal device sends a second uplink signal in athird uplink subframe on the one or more special carriers in a thirdcarrier set, and determine that the terminal device cancels sending of Mconsecutive OFDM symbols of an adjacent subframe of the third uplinksubframe. The adjacent subframe is also an uplink subframe. The thirdcarrier set includes all carriers in carrier aggregation that are usedby the terminal device to send the third uplink subframe.

The receiving module 1202 is further configured to: receive the seconduplink signal on the one or more special carriers in the third carrierset, and cancel receiving of the M consecutive OFDM symbols in theadjacent subframe of the third uplink subframe.

The M OFDM symbols are located on one or more normal carriers in thethird carrier set, and M is a positive integer and is not greater than aquantity of OFDM symbols included in the adjacent subframe.

Optionally, a length of the M OFDM symbols is not less than the fourthduration.

The fourth duration is duration in which the terminal device is switchedbetween carriers.

Optionally, the one or more normal carriers in the third carrier setbelong to a third timing advance group TAG 3, and the one or morespecial carriers in the third carrier set belong to a fourth timingadvance group TAG 4.

The length of the K symbols is not less than a sum of the fourthduration and fifth duration, and the fifth duration is a length that isagreed on in advance according to a TA difference between the TAG 3 andthe TAG 4.

Optionally, if the adjacent subframe is a next subframe of the thirduplink subframe, the M symbols are the first M OFDM symbols in the nextsubframe; and/or

if the adjacent subframe is a previous subframe of the third uplinksubframe, the M symbols are the last M OFDM symbols in the previoussubframe.

Optionally, the second uplink signal is an uplink reference signal or apreamble.

Optionally, the processing module 1201 is specifically configured to:

if determining that a power sum of the terminal device for sending thesecond uplink subframe on all the carriers in the second carrier set isgreater than a maximum transmit power of the terminal device, determinethat the terminal device cancels sending of the K OFDM symbols.

Optionally, the processing module 1201 is specifically configured to:

when a quantity of carriers included in the second carrier set isgreater than a quantity of uplink carriers that can be simultaneouslysent by the terminal device, determine that the terminal device cancelssending of the K OFDM symbols.

Optionally, the first uplink signal includes an uplink reference signaland/or a preamble.

Optionally, the uplink reference signal is a sounding reference signalSRS.

For a communications standard of a wireless communications system inwhich the network device is located, refer to the wirelesscommunications system shown in FIG. 5. For various types of the networkdevice, refer to the type of the network device 502.

For another optional implementation of the processing module 1201, referto the solution in which the network device 502 performs controlprocessing in optional solution 2 of the wireless communications systemshown in FIG. 5. For another optional implementation of the receivingmodule 1202, refer to the solution in which the network device 502performs receiving in optional solution 2 of the wireless communicationssystem shown in FIG. 5.

For two cases existing when the processing module 1201 performsprocessing, refer to the two cases in optional solution 2 of thewireless communications system shown in FIG. 5. In case 1, for acondition that is used by the processing module 1201 to determine thatthe terminal device cancels sending of some OFDM symbols on a carrier,refer to condition 1 and condition 2 in case 1 in optional solution 2 ofthe wireless communications system shown in FIG. 5. In case 2, which issimilar to case 2 in optional solution 2 of the wireless communicationssystem shown in FIG. 5, the processing module 1201 may determine thatthe terminal device cancels sending of some OFDM symbols on a normalcarrier during a switchover between the special carrier and the normalcarrier. For a rule in which the processing module 1201 determines acarrier on which the terminal device cancels sending, refer to the rulein optional solution 2 of the wireless communications system shown inFIG. 5.

The processing module 1201 may be implemented by one or more processors,and the receiving module 1202 may be implemented by one or morereceivers.

FIG. 13 is a flowchart of a first method for sending an uplink signalaccording to an embodiment of the present disclosure. As shown in FIG.13, the method includes the following steps:

S1301. A terminal device selects one or more carriers from a firstcarrier set for a first uplink subframe, where the first carrier setincludes all carriers in carrier aggregation that are used by theterminal device to send the first uplink subframe.

S1302. The terminal device cancels sending of the first uplink subframeon the selected one or more carriers.

The selected one or more carriers are normal carriers or specialcarriers.

The special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

Optionally, that a terminal device selects one or more carriers from afirst carrier set includes:

when a power sum of the terminal device for sending the first uplinksubframe on all the carriers in the first carrier set is greater than amaximum transmit power of the terminal device, selecting the one or morecarriers from the first carrier set; and

a power sum of the terminal device for sending the first uplink subframeon carriers other than the selected one or more carriers in the firstcarrier set is not greater than the maximum transmit power of theterminal device.

Optionally, that a terminal device selects one or more carriers from afirst carrier set includes:

when a quantity of carriers included in the first carrier set of theterminal device is greater than a quantity of uplink carriers that canbe simultaneously sent by the terminal device, selecting the one or morecarriers from the first carrier set; and

a quantity of carriers that is obtained by subtracting the one or morecarriers from the quantity of carriers included in the first carrier setis not greater than the quantity of uplink carriers that can besimultaneously sent by the terminal device.

Optionally, the special carrier is a carrier on which the terminaldevice sends only an uplink signal in uplink, and the uplink signalincludes an uplink reference signal and/or a preamble.

Optionally, the uplink reference signal is a sounding reference signalSRS.

In the method, for a communications standard of a wirelesscommunications system in which the terminal device and a network deviceare located, refer to the wireless communications system shown in FIG.5. For various types of the terminal device, refer to the type of theterminal device 501. For various types of the network device, refer tothe type of the network device 502.

For another optional solution of the method, refer to processing of theterminal device 501 in optional solution 1 of the wirelesscommunications system shown in FIG. 5. For example, for a condition thatis used by the terminal device to select a carrier on which sending ofan uplink subframe is canceled, refer to the processing of the terminaldevice 501 in condition 1 and condition 2 in optional solution 1 of thewireless communications system shown in FIG. 5. For a rule in which theterminal device selects a carrier on which sending is canceled, refer tothe selection rule in optional solution 1 of the wireless communicationssystem shown in FIG. 5.

FIG. 14 is a flowchart of a first method for receiving an uplink signalaccording to an embodiment of the present disclosure. As shown in FIG.14, the method includes the following steps:

S1401. A network device determines that a terminal device cancelssending of a first uplink subframe on one or more carriers in a firstcarrier set, where the first carrier set includes all carriers incarrier aggregation that are used by the terminal device to send thefirst uplink subframe.

S1402. The network device cancels receiving of the first uplink subframeon the one or more carriers.

The one or more carriers are normal carriers or special carriers.

The special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

Optionally, that a network device determines that a terminal devicecancels sending of a first uplink subframe on one or more carriers in afirst carrier set includes:

if determining that a power sum of the terminal device for sending thefirst uplink subframe on all the carriers in the first carrier set isgreater than a maximum transmit power of the terminal device,determining, by the network device, that the terminal device cancelssending of the first uplink subframe on the one or more carriers in thefirst carrier set.

Optionally, that a network device determines that a terminal devicecancels sending of a first uplink subframe on one or more carriers in afirst carrier set includes:

when a quantity of carriers included in the first carrier set is greaterthan a quantity of uplink carriers that can be simultaneously sent bythe terminal device, determining, by the network device, that theterminal device cancels sending of the first uplink subframe on the oneor more carriers in the first carrier set.

Optionally, the special carrier is a carrier on which the terminaldevice sends only an uplink signal in uplink, and the uplink signalincludes an uplink reference signal and/or a preamble.

Optionally, the uplink reference signal is a sounding reference signalSRS.

In the method, for a communications standard of a wirelesscommunications system in which the network device and the terminaldevice are located, refer to the wireless communications system shown inFIG. 5. For various types of the network device, refer to the type ofthe network device 502. For various types of the terminal device, referto the type of the terminal device 501.

For another optional implementation of the method, refer to processingof the network device 502 in optional solution 2 of the wirelesscommunications system shown in FIG. 5.

For a condition that is used by the network device to determine that theterminal device cancels sending of an uplink subframe on a carrier,refer to condition 1 and condition 2 in optional solution 1 of thewireless communications system shown in FIG. 5. For a rule in which thenetwork device 502 determines a carrier on which the terminal device 501cancels sending, refer to the rule in optional solution 1 of thewireless communications system shown in FIG. 5.

FIG. 15 is a flowchart of a second method for sending an uplink signalaccording to an embodiment of the present disclosure.

S1501. A terminal device determines to cancel sending of K consecutiveorthogonal frequency division multiplexing OFDM symbols in a seconduplink subframe.

The K OFDM symbols are located on one or more normal carriers in asecond carrier set, the second carrier set includes all carriers incarrier aggregation that are used by the terminal device to send thesecond uplink subframe, and K is a positive integer and is not greaterthan a quantity of OFDM symbols included in the second uplink subframe.

S1502. The terminal device sends a first uplink signal in the K symbolson one or more special carriers in a second carrier set.

The special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

Optionally, a length of the K symbols is not less than a sum of firstduration and second duration.

The first duration is duration required for sending the first uplinksignal.

The second duration is duration in which the terminal device is switchedbetween carriers.

Optionally, the one or more normal carriers in the second carrier setbelong to a first timing advance group TAG 1, and the one or morespecial carriers in the second carrier set belong to a second timingadvance group TAG 2.

The length of the K symbols is not less than a sum of the firstduration, the second duration, and the third duration, and the thirdduration is a length that is agreed on in advance according to a TAdifference between the TAG 1 and the TAG 2.

Optionally, the K symbols are the last K OFDM symbols in the seconduplink subframe.

Optionally, the terminal device sends a second uplink signal in a thirduplink subframe on the one or more special carriers in a third carrierset. The third carrier set includes all carriers in carrier aggregationthat are used by the terminal device to send the third uplink subframe.

The terminal device determines to cancel sending of M consecutive OFDMsymbols of an adjacent subframe of the third uplink subframe. Theadjacent subframe is also an uplink subframe.

The M OFDM symbols are located on one or more normal carriers in thethird carrier set, and M is a positive integer and is not greater than aquantity of OFDM symbols included in the adjacent subframe.

Optionally, a length of the M OFDM symbols is not less than the fourthduration.

The fourth duration is duration in which the terminal device is switchedbetween carriers.

Optionally, the one or more normal carriers in the third carrier setbelong to a third timing advance group TAG 3, and the one or morespecial carriers in the third carrier set belong to a fourth timingadvance group TAG 4.

The length of the K symbols is not less than a sum of the fourthduration and fifth duration, and the fifth duration is a length that isagreed on in advance according to a TA difference between the TAG 3 andthe TAG 4.

Optionally, if the adjacent subframe is a next subframe of the thirduplink subframe, the M symbols are the first M OFDM symbols in the nextsubframe; and/or

if the adjacent subframe is a previous subframe of the third uplinksubframe, the M symbols are the last M OFDM symbols in the previoussubframe.

Optionally, the second uplink signal includes an uplink reference signaland/or a preamble.

Optionally, that a terminal device determines to cancel sending of Kconsecutive OFDM symbols in a second uplink subframe includes:

when a power sum of the terminal device for sending the second uplinksubframe on all the carriers in the second carrier set is greater than amaximum transmit power of the terminal device, determining to cancelsending of the K OFDM symbols; and

a power sum of the terminal device for sending the second uplinksubframe on carriers other than the one or more normal carriers on whichthe K OFDM symbols are located in the second carrier set is not greaterthan the maximum transmit power of the terminal device.

Optionally, that a terminal device determines to cancel sending of Kconsecutive OFDM symbols in a second uplink subframe includes:

when a quantity of carriers included in the second carrier set of theterminal device is greater than a quantity of uplink carriers that canbe simultaneously sent by the terminal device, determining to cancelsending of the K OFDM symbols; and

a quantity of carriers that is obtained by subtracting the one or morenormal carriers on which the K OFDM symbols are located from thequantity of carriers included in the second carrier set is not greaterthan the quantity of uplink carriers that can be simultaneously sent bythe terminal device.

Optionally, the first uplink signal includes an uplink reference signaland/or a preamble.

Optionally, the uplink reference signal is a sounding reference signalSRS.

In the method, for a communications standard of a wirelesscommunications system in which the terminal device and a network deviceare located, refer to the wireless communications system shown in FIG.5. For various types of the terminal device, refer to the type of theterminal device 501. For various types of the network device, refer tothe type of the network device 502.

For another optional implementation of the method, refer to processingon a terminal device 501 side in optional solution 2 of the wirelesscommunications system shown in FIG. 5.

For two cases existing when the terminal device performs processing,refer to the two cases in optional solution 2 of the wirelesscommunications system shown in FIG. 5. In case 1, for a condition thatis used by the terminal device to select a carrier on which sending ofsome OFDM symbols is canceled, refer to condition 1 and condition 2 incase 1 in optional solution 2 of the wireless communications systemshown in FIG. 5. In case 2, which is similar to case 2 in optionalsolution 2 of the wireless communications system shown in FIG. 5, theterminal device may cancel sending of some OFDM symbols on a normalcarrier during a switchover between the special carrier and the normalcarrier. For a rule in which the terminal device selects a carrier onwhich sending is canceled, refer to the selection rule in optionalsolution 2 of the wireless communications system shown in FIG. 5.

FIG. 16 is a flowchart of a second method for receiving an uplink signalaccording to an embodiment of the present disclosure. As shown in FIG.16, the method includes the following steps:

S1601. A network device determines that a terminal device cancelssending of K consecutive orthogonal frequency division multiplexing OFDMsymbols in a second uplink subframe, and determines that the terminaldevice sends a first uplink signal in the K symbols on one or morespecial carriers in the second carrier set.

The K OFDM symbols are located on one or more normal carriers in thesecond carrier set, the second carrier set includes all carriers incarrier aggregation that are used by the terminal device to send thesecond uplink subframe, and K is a positive integer and is not greaterthan a quantity of OFDM symbols included in the second uplink subframe.

S1602. The network device cancels receiving of the K OFDM symbols, andreceives the second uplink signal in the K symbols on the one or morespecial carriers in the second carrier set.

The special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to senduplink data and/or uplink control information.

Optionally, a length of the K symbols is not less than a sum of firstduration and second duration.

The first duration is duration required for sending the first uplinksignal.

The second duration is duration in which the terminal device is switchedbetween carriers.

Optionally, the one or more normal carriers in the second carrier setbelong to a first timing advance group TAG 1, and the one or morespecial carriers in the second carrier set belong to a second timingadvance group TAG 2.

The length of the K symbols is not less than a sum of the firstduration, the second duration, and the third duration, and the thirdduration is a length that is agreed on in advance according to a TAdifference between the TAG 1 and the TAG 2.

Optionally, the K symbols are the last K OFDM symbols in the seconduplink subframe.

Optionally, the method further includes:

determining, by the network device, that the terminal device sends asecond uplink signal in a third uplink subframe on the one or morespecial carriers in a third carrier set, and determining that theterminal device cancels sending of M consecutive OFDM symbols of anadjacent subframe of the third uplink subframe, where the adjacentsubframe is also an uplink subframe, and the third carrier set includesall carriers in carrier aggregation that are used by the terminal deviceto send the third uplink subframe; and

receiving, by the network device, the second uplink signal on the one ormore special carriers in the third carrier set, and canceling receivingof the M consecutive OFDM symbols in the adjacent subframe of the thirduplink subframe.

The M OFDM symbols are located on one or more normal carriers in thethird carrier set, and M is a positive integer and is not greater than aquantity of OFDM symbols included in the adjacent subframe.

Optionally, a length of the M OFDM symbols is not less than the fourthduration.

The fourth duration is duration in which the terminal device is switchedbetween carriers.

Optionally, the one or more normal carriers in the third carrier setbelong to a third timing advance group TAG 3, and the one or morespecial carriers in the third carrier set belong to a fourth timingadvance group TAG 4.

The length of the K symbols is not less than a sum of the fourthduration and fifth duration, and the fifth duration is a length that isagreed on in advance according to a TA difference between the TAG 3 andthe TAG 4.

Optionally, if the adjacent subframe is a next subframe of the thirduplink subframe, the M symbols are the first M OFDM symbols in the nextsubframe; and/or

if the adjacent subframe is a previous subframe of the third uplinksubframe, the M symbols are the last M OFDM symbols in the previoussubframe.

Optionally, the second uplink signal is an uplink reference signal or apreamble.

Optionally, that a network device determines that a terminal devicecancels sending of K consecutive OFDM symbols in a second uplinksubframe includes:

if determining that a power sum of the terminal device for sending thesecond uplink subframe on all the carriers in the second carrier set isgreater than a maximum transmit power of the terminal device,determining, by the network device, that the terminal device cancelssending of the K OFDM symbols.

Optionally, that a network device determines that a terminal devicecancels sending of K consecutive OFDM symbols in a second uplinksubframe includes:

when a quantity of carriers included in the second carrier set isgreater than a quantity of uplink carriers that can be simultaneouslysent by the terminal device, determining, by the network device, thatthe terminal device cancels sending of the K OFDM symbols.

Optionally, the first uplink signal includes an uplink reference signaland/or a preamble.

Optionally, the uplink reference signal is a sounding reference signalSRS.

In the method, for a communications standard of a wirelesscommunications system in which the terminal device and the networkdevice are located, refer to the wireless communications system shown inFIG. 5. For various types of the network device, refer to the type ofthe network device 502. For various types of the terminal device, referto the type of the terminal device 501.

For another optional implementation of the method, refer to processingof the network device 502 in optional solution 2 of the wirelesscommunications system shown in FIG. 5.

In the method, for two cases existing when the network device performsprocessing, refer to the two cases in optional solution 2 of thewireless communications system shown in FIG. 5. In case 1, for acondition that is used by the network device to determine that theterminal device cancels sending of some OFDM symbols on a carrier, referto condition 1 and condition 2 in case 1 in optional solution 2 of thewireless communications system shown in FIG. 5. In case 2, which issimilar to case 2 in optional solution 2 of the wireless communicationssystem shown in FIG. 5, the network device may determine that theterminal device cancels sending of some OFDM symbols on a normal carrierduring a switchover between the special carrier and the normal carrier.For a rule in which the network device determines a carrier on which theterminal device cancels sending, refer to the rule in optional solution2 of the wireless communications system shown in FIG. 5.

In the embodiments of the present disclosure, an uplink subframe on somecarriers is rejected or some ODFM symbols of an uplink subframe on somecarriers are rejected, to resolve a problem that information such asdownlink channel characteristics of some carriers cannot be obtainedwhen no uplink reference signal (such as an SRS) is sent on thesecarriers. In addition, a conflict is avoided.

Persons skilled in the art should understand that the embodiments of thepresent disclosure may be provided as a method, a system, or a computerprogram product. Therefore, the present disclosure may use a form ofhardware only embodiments, software only embodiments, or embodimentswith a combination of software and hardware. Moreover, the presentdisclosure may use a form of a computer program product that isimplemented on one or more computer-usable storage media (including butnot limited to a disk memory, a CD-ROM, an optical memory, and the like)that include computer-usable program code.

The present disclosure is described with reference to the flowchartsand/or block diagrams of the method, the device (system), and thecomputer program product according to the embodiments of the presentdisclosure. It should be understood that computer program instructionsmay be used to implement each process and/or each block in theflowcharts and/or the block diagrams and a combination of a processand/or a block in the flowcharts and/or the block diagrams. Thesecomputer program instructions may be provided for a general-purposecomputer, a dedicated computer, an embedded processor, or a processor ofanother programmable data processing device to generate a machine, sothat the instructions executed by a computer or a processor of anotherprogrammable data processing device generate an apparatus forimplementing a specific function in one or more processes in theflowcharts and/or in one or more blocks in the block diagrams.

These computer program instructions may be stored in a computer readablememory that can instruct a computer or another programmable dataprocessing device to work in a specific manner, so that the instructionsstored in the computer readable memory generate an artifact thatincludes an instruction apparatus. The instruction apparatus implementsa specific function in one or more processes in the flowcharts and/or inone or more blocks in the block diagrams.

These computer program instructions may be loaded onto a computer oranother programmable data processing device, so that a series ofoperations and steps are performed on the computer or the anotherprogrammable device, thereby generating computer-implemented processing.Therefore, the instructions executed on the computer or the anotherprogrammable device provide steps for implementing a specific functionin one or more processes in the flowcharts and/or in one or more blocksin the block diagrams.

Although some preferred embodiments of the present disclosure have beendescribed, persons skilled in the art can make changes and modificationsto these embodiments once they learn the basic inventive concept.Therefore, the following claims are intended to be construed as to coverthe preferred embodiments and all changes and modifications fallingwithin the scope of the present disclosure.

Obviously, persons skilled in the art can make various modifications andvariations to the embodiments of the present disclosure withoutdeparting from the spirit and scope of the embodiments of the presentdisclosure. The present disclosure is intended to cover thesemodifications and variations provided that they fall within the scope ofprotection defined by the following claims and their equivalenttechnologies.

What is claimed is:
 1. A terminal device, comprising: a processor,configured to determine that the terminal device cancels sending of Kconsecutive orthogonal frequency division multiplexing (OFDM) symbols inan uplink subframe, wherein the K OFDM symbols are located on one ormore normal carriers in a carrier set, the carrier set comprises allcarriers in carrier aggregation that are used by the terminal device tosend the uplink subframe, and K is a positive integer and is not greaterthan a quantity of OFDM symbols comprised in the uplink subframe; and atransmitter, configured to send an uplink signal in the K symbols on oneor more special carriers in the carrier set, wherein the special carrieris a carrier on which the terminal device sends neither uplink data noruplink control information in uplink, and the normal carrier is acarrier that is used by the terminal device to send at least one kind ofuplink data and uplink control information.
 2. The terminal deviceaccording to claim 1, wherein a length of the K symbols is not less thana sum of first duration and second duration; the first duration isduration required for sending the uplink signal; and the second durationis duration in which the terminal device is switched between carriers.3. The terminal device according to claim 2, wherein the one or morenormal carriers in the carrier set belong to a first timing advancegroup (TAG 1), and the one or more special carriers in the carrier setbelong to a second timing advance group (TAG 2); and the length of the Ksymbols is not less than a sum of the first duration, the secondduration, and the third duration, and the third duration is a lengththat is agreed on in advance according to a TA difference between theTAG 1 and the TAG
 2. 4. The terminal device according to claim 1,wherein the K symbols are the last K OFDM symbols in the uplinksubframe.
 5. The terminal device according to claim 1, wherein thetransmitter is further configured to send an uplink signal in anotheruplink subframe on one or more special carriers in another carrier set,wherein the another carrier set comprises all carriers in carrieraggregation that are used by the terminal device to send the anotheruplink subframe; and the processor module is further configured todetermine that the terminal device cancels sending of M consecutive OFDMsymbols of an adjacent uplink subframe of the another uplink subframe,wherein the M OFDM symbols are located on one or more normal carriers inthe another carrier set, and M is a positive integer and is not greaterthan a quantity of OFDM symbols comprised in the adjacent uplinksubframe.
 6. The terminal device according to claim 5, wherein a lengthof the M OFDM symbols is not less than fourth duration; and the fourthduration is duration in which the terminal device is switched betweencarriers.
 7. A network device, comprising: a processor, configured to:determine that a terminal device cancels sending of K consecutiveorthogonal frequency division multiplexing (OFDM) symbols in an uplinksubframe, and determine that the terminal device sends a first uplinksignal in the K symbols on one or more special carriers in a carrierset, wherein the K OFDM symbols are located on one or more normalcarriers in the carrier set, the carrier set comprises all carriers incarrier aggregation that are used by the terminal device to send theuplink subframe, and K is a positive integer and is not greater than aquantity of OFDM symbols comprised in the uplink subframe; and areceiver, configured to: cancel receiving of the K OFDM symbols, andreceive the first uplink signal in the K symbols on the one or morespecial carriers in the carrier set, wherein the special carrier is acarrier on which the terminal device sends neither uplink data noruplink control information in uplink, and the normal carrier is acarrier that is used by the terminal device to send at least one kind ofuplink data and uplink control information.
 8. The network deviceaccording to claim 7, wherein a length of the K symbols is not less thana sum of first duration and second duration; the first duration isduration required for sending the first uplink signal; and the secondduration is duration in which the terminal device is switched betweencarriers.
 9. The network device according to claim 8, wherein the one ormore normal carriers in the carrier set belong to a first timing advancegroup (TAG 1) and the one or more special carriers in the carrier setbelong to a second timing advance group (TAG 2); and the length of the Ksymbols is not less than a sum of the first duration, the secondduration, and the third duration, and the third duration is a lengththat is agreed on in advance according to a TA difference between theTAG 1 and the TAG
 2. 10. The network device according to claim 7,wherein the K symbols are the last K OFDM symbols in the uplinksubframe.
 11. An uplink sending method, comprising: determining, by aterminal device, to cancel sending of K consecutive orthogonal frequencydivision multiplexing (OFDM) symbols in an uplink subframe, wherein theK OFDM symbols are located on one or more normal carriers in a carrierset, the carrier set comprises all carriers in carrier aggregation thatare used by the terminal device to send the uplink subframe, and K is apositive integer and is not greater than a quantity of OFDM symbolscomprised in the uplink subframe; and sending, by the terminal device, afirst uplink signal in the K symbols on one or more special carriers inthe carrier set, wherein the special carrier is a carrier on which theterminal device sends neither uplink data nor uplink control informationin uplink, and the normal carrier is a carrier that is used by theterminal device to send at least one kind of uplink data and uplinkcontrol information.
 12. The method according to claim 11, wherein alength of the K symbols is not less than a sum of first duration andsecond duration; the first duration is duration required for sending theuplink signal; and the second duration is duration in which the terminaldevice is switched between carriers.
 13. The method according to claim12, wherein the one or more normal carriers in the carrier set belong toa first timing advance group (TAG 1), and the one or more specialcarriers in the carrier set belong to a second timing advance group (TAG2); and the length of the K symbols is not less than a sum of the firstduration, the second duration, and the third duration, and the thirdduration is a length that is agreed on in advance according to a TAdifference between the TAG 1 and the TAG
 2. 14. The method according toclaim 11, wherein the K symbols are the last K OFDM symbols in theuplink subframe.
 15. The method according to claim 11, furthercomprising: sending, by the terminal device, an uplink signal in anotheruplink subframe on one or more special carriers in another carrier set,wherein the another carrier set comprises all carriers in carrieraggregation that are used by the terminal device to send the anotheruplink subframe; and determining, by the terminal device, to cancelsending of M consecutive OFDM symbols of an adjacent uplink subframe ofthe another uplink subframe, wherein the M OFDM symbols are located onone or more normal carriers in the another carrier set, and M is apositive integer and is not greater than a quantity of OFDM symbolscomprised in the adjacent uplink subframe.
 16. An uplink receivingmethod, comprising: determining, by a network device, that a terminaldevice cancels sending of K consecutive orthogonal frequency divisionmultiplexing (OFDM) symbols in an uplink subframe, and determining thatthe terminal device sends a first uplink signal in the K symbols on oneor more special carriers in a carrier set, wherein the K OFDM symbolsare located on one or more normal carriers in the carrier set, thecarrier set comprises all carriers in carrier aggregation that are usedby the terminal device to send the uplink subframe, and K is a positiveinteger and is not greater than a quantity of OFDM symbols comprised inthe uplink subframe; and canceling, by the network device, receiving ofthe K OFDM symbols, and receiving the second uplink signal in the Ksymbols on the one or more special carriers in the carrier set, whereinthe special carrier is a carrier on which the terminal device sendsneither uplink data nor uplink control information in uplink, and thenormal carrier is a carrier that is used by the terminal device to sendat least one kind of uplink data and uplink control information.
 17. Themethod according to claim 16, wherein a length of the K symbols is notless than a sum of first duration and second duration; the firstduration is duration required for sending the first uplink signal; andthe second duration is duration in which the terminal device is switchedbetween carriers.
 18. The method according to claim 17, wherein the oneor more normal carriers in the carrier set belong to a first timingadvance group (TAG 1) and the one or more special carriers in thecarrier set belong to a second timing advance group (TAG 2); and thelength of the K symbols is not less than a sum of the first duration,the second duration, and the third duration, and the third duration is alength that is agreed on in advance according to a TA difference betweenthe TAG 1 and the TAG
 2. 19. The method according to claim 16, whereinthe K symbols are the last K OFDM symbols in the uplink subframe.